Improvement in turning and boring-mills



dimitri hm GEORGE A. GRAY, JR., OF CINCINNATI, OHIO.

Letters Patent No. 113,651, dated April 11, 1871.

IMPROVEMENT IN TURNING AND BORING-MlLLS.

The Schedule referred to tu these' Letters Patent and making part of the same.

To all whom it may concern:

Be it known that I, GEORGE A. GRAY, J r., of Cincinnati, Hamilton county, State ofOhio, have -invent-ed certain new and useful Improvements in Turning and Boring-Mills and I do hereby declare the following to bey a suticiently full, clear, and exact description thereof to enable one skilled in the art to which my invention appertains to make and use it, reference being had to the accompanying drawing making part of this specification. Nam/re and Objects of Invention.

My invention consists- First, in a peculiar device for balancing the tool-barv in any position within its range in such a way as to keep the weight up against the feed, and thus prevent the bar being forced up by the work when any slack exists in the feed, and permit of the bar heilig elevated and depressed freely by hand; this balancing device ditferin g from all others for the same purpose iuthis, that the bar can be moved to any degree of angulari ty iroin au upright or other position, and moved with its saddle along the rail horizontally, without changing the location of the weight which balances the bar.

Second, in a peculiar construction of the outer bearing, by which the oil is collected and prevented from escaping, and also protected from dirt or turning chips.

Description of the Accompanying.Dra/wing.

Figure l is a front elevation of a boring and turningmill embodying my invention.

Figure 2 is a side elevation of the same.

Figure 3 is a vert-ical section of a part of the .table and the devices for supporting and operating it.

Figure 4 is a section exhibiting the peculiar construction of the outer bearing of the table.`

General Description'.

A is the bed-plate of the mill 5 B B', the housings; C, the rail; and

D,.the horizontally sliding saddle, which is snugly fitted to and slides upon the rail.

E is the revolving table, operated in the usual way by the large gear-wheel F, driven (through suitable connections) by the cone-pulley G and back-gear H.

The down-feed can be stopped by the slackeuing of the wheel N, which governs the friction-clutch.

Both the cross and down-feed are driven bythe expausible gearing shown operated by the shaft 0.

lhe rail C is designed to be raised and lowered by power, the side screws I? P and ,connecting drivingshaft on the top rail being provided for this purpose.

The swing Q, in which the bar K slides, is constructed as usual in such a way that the bar can be swiveled to any desired angle to enable the machine to' bore and turn tapering, Sie.

In order to balance the weight of the tool-bar in any position, whether inclined or vertical, in a way that will possess none of the faults attribut-able to devices heretofore existing for this purpose, I have provided the following device:

Pulleys R It are journaled upon the swing Q, pulley S upon the tool-bar, and pulley 'l upon the end oi' the rail.

A rope, chain, or wire cord, U, fastened at one end' upon the rail, at c', is then passed over the pulley R under the pulley S, over the pulley R', and over the pulley T, where it supports a weight, V, which must be slightly heavier than halt' the weight of the bar K only. This device suiiices to keep the bar up snugly against the force that feeds it down, so that the tool can never drop when slack exists in the feed. It also enables the swing Q to be moved to a very extreme angle without deranging any ot' the parts or materially changing the eii'ect of the weight V upon the bar, or even disturbing the weight itself.

The bolts \V serve to secure the swing in any position to which it may be adjusted, they being fitted to a circular T-headed groove in the saddle D.

The tool-bar slides between the gibs X on the swing, carrying, ofcourse, the pulley S with it. If itis necessary to secure the bar firmly in any given position the bolt Y is designed to accomplish it.

The bar Ii can be elevated and depressed by hand easily (being balanced) by means of the hand-wheel Z, which has a pinion upon its stein gearing into the rack M. When the bar K is lowered the weight V is elevated, and when the bar K is raised the weight V descends, the weight always moving at twice the velocity of the bar. The rope or chain U is made suf'- ficieutly long to permit of the weightbeing unhooked from it 'and reattached lower down when the rail C is elevated; oi' the chain may pass through the floor into a cellar, having suicicnt vertical height for the entire range of the weight.

The apparatus a bc, when connected to the line oi' driving shafting hy belts, is used through suitable vertical side screws to raise and lower the rail C. This device, however, is old and well known, and forms no part ot' my invention.

The. revolving table E I have constructed in such a way that at the will of the operator it may be made to revolve on a central shaft or journal only for fast speed and small work; or to revolve upon an annular horizontal nearing of large dia-meter iu connection Vwith the central journal for large, heavy work.

The construction I have devised to accomplish this is as follows:

A cylindrical socket, d, is formed in the frame A of `the machine. This socketis fitted with a sleeve, e, constructed to slide vertically and snugly in the socket. A bearing is formed in this sleeve efor the central journal fof the table E. The journal f may have the shiel curve conliguration, as shown, or may be either conical or cylindrical. 7 'Y 'lhe outer rim g of the table is faced ol on the under side for a bearing surface, and iliade to rest, when adjusted for largeA work, upon the annular hori- 'zontal bearing h of the frame A.

A wedge, i, istted into the socket d in such away that it rests upon the foundation-plate of the frame A, and*Y supports the sliding sleeve e and sometimes lieved from the hearing h. In this condition the table is supported bythe wedge, and can be revolved at a high speed for light small work or polishi-nc'. s

When the wedge is drawn back so that the table falls to a support upon the bearing h the machine is adapted for heavy werk, the outer bearing preventing the tremor incident t-o boring-mills having only acentral bearing when under a heavy out.

The outer bearing h is provided, on its inner and outer edges, with circular grooves m m', and elevated circular lips n a. The grooves form circular pockets for collecting sediment from the oil, and the lips serve to l'orm a chamber or chambers i'or the accumulation of oil, and enable the bearing g ito be buried in oil. The oil is fed or supplied through snit-able apertures drilled through the table into the face of' the bearing g. 'lhe central bearing e is supplied with oil through a hole drilled in the journal f. 'i

. 'lhe outer edge ot' the table E is provided with a pendent circular lip, p, which projects over the outer lip a', and serves to prevent dirt, dust, or turning chips from getting into the hearing g h.

The lower end of the tool-bar K is bored with a tapering hole or socket for the reception of the ordinary tool-holder, which is secured in the socket of the bar K'by means of tapering pin r.

l Claim.. j Y 1. The tool-bar balancingdevice herein described,

consisting of rope or chain U, weight V, and pulleys Y' Witnesses:

J. L. WARTMANN, ELITHA F. LAYMAN. 

